There are no arguments to the constructor the object will be in its default state. You can use the setNodeFilter, setTraversalMethod, includeTrunk and searchForNodeValue methods to customize its behavior.

By default we will use Tree::Simple's built in depth-first (pre-order) traverse method. If however, you desire the tree to be search in a different ordering, this can be accomplished using a different traversal method, you can supply a $visitor object implementing that traversal type to this method (See Tree::Simple::Visitor::BreadthFirstTraversal, Tree::Simple::Visitor::PreOrderTraversal and Tree::Simple::Visitor::PostOrderTraversal).

This method accepts a CODE reference as its $filter_function argument and throws an exception if it is not a code reference. This code reference is used to further check the tree nodes as they are searched and so can be used to customize search behavior. For instance, you could to check against the node value as well as some other criteria. The filter function should accept a single argument, which is the current Tree::Simple object and return either true (1) on success, or false (0) on failure.

This is the method that is used by Tree::Simple's accept method. It can also be used on its own, it requires the $tree argument to be a Tree::Simple object (or derived from a Tree::Simple object), and will throw and exception otherwise.